Tower of Mendoza, Medieval fortified tower in Mendoza, Vitoria-Gasteiz, Spain.

The Tower of Mendoza is a fortified tower in the village of Mendoza, near Vitoria-Gasteiz. It stands at the centre of an almost quadrangular walled enclosure of irregular limestone courses, with four cylindrical turrets about three metres in interior diameter at the corners. The keep has five floors: the ground and first floors are of wood, the upper three have defensive openings, and the top is covered by a roof.

Iñigo López de Mendoza, fourth Lord of Llodio, built the tower in the early 13th century; he fought at the Battle of Las Navas de Tolosa in 1212 and added a border of chains to his coat of arms. The Dukes of Infantado held it until 1856, when it was sold to Bruno Martínez de Aragón y Echanove, who ceded it to the Diputación Foral de Álava in 1962 for restoration. It was returned to its owners on 15 December 2012.

The tower housed the Museum of Heraldry of Álava for fifty years, until it was returned to its owners on 15 December 2012. Its collection gathered medieval shields and clothing and information on the heraldry of Álava. The museum closed because the building did not meet accessibility regulations; a room in the castle still displays the shields of the most important families of Álava.

The tower stands in the village of Mendoza, near Vitoria-Gasteiz, in a walled enclosure with four cylindrical corner turrets. The heraldry museum it once housed is closed because the building does not meet accessibility regulations, so visits are limited to the exterior. From the main facade you can see the gap of the Puebla de Arganzón, where the old road reached the Zadorra.

The four corner turrets of the enclosure are cylindrical, about three metres across inside, and were capped with stone slabs like the surrounding wall. Of the five strong towers held by the Mendoza lineage — Mendoza, Mendívil, Mártioda, Estarrona and Hueto Abajo — only this one and Mártioda still stand.